Temperature effect on fine-grained structure formation in high-strength Al alloy 7475 during hot severe deformation

Sitdikov, Oleg; Sakai, Taku; Miura, Hiromi; Hama, C.

doi:10.1016/j.msea.2009.03.037

Cited by 74 publications

(48 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The present model effectively assumes a saturation misorientation angle is reached in the SPD regime. The latter is in line with data on SPD through multidirectional forging of Al-7475 at temperatures from 300ºC, where the average grain boundary misorientation angle reaches a saturation angle of about 31º for strains of about 6 [92]. ECAP at 250ºC…”

Section: Aspects Of Grain Boundary Evolution Not Included In the Pressupporting

confidence: 88%

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

et al. 2009

View full text Add to dashboard Cite

The grain refinement during severe plastic deformation (SPD) is predicted using volume averaged amount of dislocations generated. The model incorporates a new expansion of a model for hardening in the parabolic hardening regime, in which the work hardening depends on the effective dislocation free path related to the presence of non shearable particles and solute-solute nearest neighbour interactions.These two mechanisms give rise to dislocation multiplication in the form of generation of geometrically necessary dislocations and dislocations induced by local bond energies. The model predicts the volume averaged amount of dislocations generated and considers that they distribute to create cell walls and move to existing cell walls/grain boundaries where they increase in the grain boundary misorientation. The model predicts grain sizes of Al alloys subjected to SPD over 2 orders of magnitude. The model correctly predicts the considerable influence of Mg content and content of nonshearable particles on the grain refinement during SPD.

show abstract

Section: Aspects Of Grain Boundary Evolution Not Included In the Pressupporting

confidence: 88%

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Based on the above observations and the results of other research [22,39,[41][42][43], we can try to generalize the phenomena of plastic deformation occurring during forging of an Fe 3 Al-based intermetallic alloy investigated in this work. In the initial stage of deformation, the enormous rise of the dislocation density occurs in the material.…”

Section: Discussionmentioning

confidence: 83%

“…In the context of the present work, it is important to point out that Sitdikov et al [41] investigated the behavior of Al 7475 alloy subjected to a multi-directional forging and they described the model of the structure rebuilding during the SPD process. As a result of material deformation, the classical dislocation substructure of nucleating shear microbands was formed.…”

Section: Discussionmentioning

confidence: 99%

“…The process of multi-axial forging causing multi-directional shear accelerates the transformation of primary grain microbands into a fine-grained, equiaxed structure. According to Sitdikov et al [41], the temperature increase intensifies the structure rebuilding process. However, due to the possible occurrence of grain boundary sliding, the strain mechanism adopts a mixed character, combining a microband slip and the nucleation of shear.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

2016

View full text Add to dashboard Cite

Tri-axial plane-strain forging was applied to the Fe-28Al-5Cr-0.8Zr-0.04B intermetallic alloy, in order to study its grain refinement and possible improvement in mechanical properties. The forging temperature range was from 20 to 600°C. The maximum number of forging passes was 67. The deformed microstructure was investigated using electron backscatter diffraction in a scanning electron microscope. At forging temperatures \500°C, the alloy was very prone to brittle cracking. At the temperature range of 500-600°C, the overall plasticity of material increased and the cracking tendency was reduced but not completely eliminated. Extensive processes of dynamic recovery/recrystallization were observed during forging at 600°C after 10-40 passes. Recrystallized areas with an average grain size of a few micrometers were observed. However, even after severe deformation at 600°C, resulting from 40 forging passes (e * 11.3), dynamic recrystallization was incomplete and the fraction of low-angle boundaries was still high. The Vickers microhardness substantially increased from 280 HV0.1 to 450 HV0.1 at the center of the sample after both deformations at room temperature as well as after 20-40 cycles at 500-600°C. However, a further increase of strain for a sample deformed at 600°C after 67 passes (e * 28) led to quite a significant hardness decrease at the center of the sample. This phenomenon could be associated with the initiation of dynamic recrystallization. None of the samples forged at the 500-600°C range exhibited any ductility improvement during subsequent tensile testing at room temperature, most likely, owing to the absence of a uniform ultrafine-grained structure developed during forging.

show abstract

“…Due to the repeating rotation of the loading direction with deformation passes during MDF, cumulative strain applied from various directions is very significant for the evolution of grain structure and flow behavior of the materials subjected to deformation. A large number of investigations on MDF have indicated that microstructure change during MDF, especially grain refinement, can be controlled by various process factors, such as strain pass, deformation temperature, strain rate, alloying elements, second phase, etc [8][9][10][11][12][13]. Sitdikov et al have found that the grain size and its volume fraction in 7475 aluminum alloys during hightemperature multi-directional compression are obviously different from those subjected to uniaxial compression [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Finite Element Analysis of Flow Behavior of 2A14 Aluminum Alloy during Multi-directional Forging

Wang¹,

Wang²,

Liu³

et al. 2017

IJOER

View full text Add to dashboard Cite

show abstract

Temperature effect on fine-grained structure formation in high-strength Al alloy 7475 during hot severe deformation

Cited by 74 publications

References 33 publications

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

Multi-axial forging of Fe3Al-base intermetallic alloy and its mechanical properties

Experimental and Finite Element Analysis of Flow Behavior of 2A14 Aluminum Alloy during Multi-directional Forging

Contact Info

Product

Resources

About